The 20-year-old Zverev, who has collected 5 ATP World Tour titles this season, lost his temper when broken by the Argentine at 2-2 in the decider and flung his racquet down to the ground.

"I think he played a great match, maybe one of the best of the season. I think we both played pretty well from the baseline...but for me, in my eyes it's impossible to lose a match where I get broken one time and I still lose it except if you play against Isner or Karlovic, someone like that.," Zverev said after the match.

Zverev came to the match strong and raced to a 3-0 lead in the first set within 10 minutes. But Del Potro found his form in the second set, scored 5 love games and levelled the set-score with a 7-5 victory in the tiebreak.

"I think I didn't play well the first game of the match with my serve, but when I saw the stats on the TV, and I was winning more points returning than him, but I lost the set. I say to me, Okay, you're playing good. You have to just try to keep going. And that's what I did for the second and the third set," the 2009 US Open champion Del Potro said.

Zverev, who has already secured a berth in the ATP World Tour Finals in London, fired 22 Aces in the match, but couldn't find solutions when his opponent served.

Del Potro, the 2013 Shanghai Masters runner-up, will face either American no. 12 seed John Isner or Viktor Troicki of Serbia on Friday.

Anh who ranked fourth in the recent AsiaOceania zonal Olympic qualifying tournament in China， was pushed up to third in the foil category to be granted the Olympic berth， daily newspaper Vietnam News reported.

The International Fencing Federation informed Vietnam that Anh got the ticket after Yuan Ping of New Zealand who finished second in the foil category， was ruled ineligible for the Olympics as the former Commonwealth champion previously competed under China jersey.

So far， Vietnam has secured 20 Olympian tickets in fencing， weightlifting， badminton， wrestling， shooting， gymnastics， swimming， athletics， rowing and judo. Local sports officials were waiting for more qualifiers in athletics and swimming.

Without winning any gold medals in past Olympic Games， Vietnam has brought home a total of two silvers in taekwondo from Sydney 2000 and in weightlifting from Beijing 2008.

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